package com.wh.wisdomsite.xbox.utils.encrypt.des;

import com.wh.wisdomsite.xbox.utils.random.RandomTool;

import java.io.UnsupportedEncodingException;
import java.security.Key;
import java.security.Security;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;

/**
 * DES加密解密算法
 * @author yangwenjian
 * @serial   http://hkllzh.iteye.com/blog/1295245
 * @version V1.0.0
 */
public class DESPlus {
	private static  String strDefaultKey = "zsd2238700";
	private Cipher encryptCipher = null;
	private Cipher decryptCipher = null;
	private static final String UNICODE_FORMAT = "UTF-8";

	/**
	 * 将byte数组转换为表示16进制值的字符串， 如：byte[]{8,18}转换为：0813， 和public static byte[]
	 * hexStr2ByteArr(String strIn) 互为可逆的转换过程
	 *
	 * @param arrB 需要转换的byte数组
	 * @return 转换后的字符串
	 * @throws Exception 本方法不处理任何异常，所有异常全部抛出
	 */
	public static String byteArr2HexStr(byte[] arrB) {
		int iLen = arrB.length;
		// 每个byte用两个字符才能表示，所以字符串的长度是数组长度的两倍
		StringBuffer sb = new StringBuffer(iLen * 2);
		for (int i = 0; i < iLen; i++) {
			int intTmp = arrB[i];
			// 把负数转换为正数
			while (intTmp < 0) {
				intTmp = intTmp + 256;
			}
			// 小于0F的数需要在前面补0
			if (intTmp < 16) {
				sb.append("0");
			}
			sb.append(Integer.toString(intTmp, 16));
		}
		return sb.toString();
	}

	/**
	 * 将表示16进制值的字符串转换为byte数组， 和public static String byteArr2HexStr(byte[] arrB)
	 * 互为可逆的转换过程
	 *
	 * @param strIn 需要转换的字符串
	 * @return 转换后的byte数组
	 */
	public static byte[] hexStr2ByteArr(String strIn) {
		byte[] arrB = null;
		try {
			arrB = strIn.getBytes(UNICODE_FORMAT);
		} catch (Exception e) {
			e.printStackTrace();
			return arrB;
		}

		int iLen = arrB.length;
		// 两个字符表示一个字节，所以字节数组长度是字符串长度除以2
		byte[] arrOut = new byte[iLen / 2];
		try {
			for (int i = 0; i < iLen; i = i + 2) {
				String strTmp = new String(arrB, i, 2);
				arrOut[i / 2] = (byte) Integer.parseInt(strTmp, 16);
			}
		} catch (Exception e) {
			e.printStackTrace();
			return null;
		}
		return arrOut;
	}

	/**
	 * 默认构造方法，使用默认密钥
	 *
	 * @throws Exception
	 */
	public DESPlus() throws Exception {
		this(strDefaultKey);
	}

	/**
	 * 指定密钥构造方法
	 *
	 * @param strKey 指定的密钥
	 * @throws Exception
	 */
	public DESPlus(String strKey) {
		Security.addProvider(new com.sun.crypto.provider.SunJCE());
		Key key;
		try {
			key = getKey(strKey.getBytes());
			encryptCipher = Cipher.getInstance("DES");
			encryptCipher.init(Cipher.ENCRYPT_MODE, key);
			decryptCipher = Cipher.getInstance("DES");
			decryptCipher.init(Cipher.DECRYPT_MODE, key);
		} catch (Exception e) {
			e.printStackTrace();
		}
	}

	/**
	 * 加密字节数组
	 */
	public byte[] encrypt(byte[] arrB) {
		byte[] s = null;
		try {
			s = encryptCipher.doFinal(arrB);
		} catch (IllegalBlockSizeException e) {
			e.printStackTrace();
		} catch (BadPaddingException e) {
			e.printStackTrace();
		}
		return s;
	}

	/**
	 * 将启动码strIn加密，返回加密后的启动码
	 */
	public String encrypt(String strIn) {
		byte[] bytes = null;
		try {
			bytes = strIn.getBytes(UNICODE_FORMAT);
		} catch (Exception e) {
			e.printStackTrace();
		}
		return byteArr2HexStr(encrypt(bytes));
	}


	/**
	 * 解密字节数组
	 */
	public byte[] decrypt(byte[] arrB) {
		byte[] s = null;
		try {
			s = decryptCipher.doFinal(arrB);
		} catch (IllegalBlockSizeException e) {
			e.printStackTrace();
		} catch (BadPaddingException e) {
			e.printStackTrace();
		}
		return s;
	}

	/**
	 * 解密 strIn
	 */
	public String decrypt(String strIn) throws UnsupportedEncodingException {
		return new String(decrypt(hexStr2ByteArr(strIn)), UNICODE_FORMAT);
	}

	/**
	 * 从指定字符串生成密钥，密钥所需的字节数组长度为8位 不足8位时后面补0，超出8位只取前8位
	 *
	 * @param arrBTmp 构成该字符串的字节数组
	 * @return 生成的密钥
	 * @throws Exception
	 */
	private Key getKey(byte[] arrBTmp) {
		// 创建一个空的8位字节数组（默认值为0）
		byte[] arrB = new byte[8];
		// 将原始字节数组转换为8位
		for (int i = 0; i < arrBTmp.length && i < arrB.length; i++) {
			arrB[i] = arrBTmp[i];
		}
		// 生成密钥
		Key key = new javax.crypto.spec.SecretKeySpec(arrB, "DES");
		return key;
	}

	public static String getStrDefaultKey() {
		return strDefaultKey;
	}

	public static void setStrDefaultKey(String strDefaultKey) {
		DESPlus.strDefaultKey = strDefaultKey;
	}



    public static void main(String[] args) throws Exception {
        System.out.println("############加减密第1测试开始###########");
        String cKey = RandomTool.getNumberLetterAll(16);
        cKey = "zsd2238700";

        String cSrc = "系統研發課，Email : xxx@xxx.com系統研發課，Email : xxx@xxx.com系統研發課，Email : xxx@xxx.com系統研發課，Email : xxx@xxx.com系統研發課，Email : xxx@xxx.com系統研發課，Email : xxx@xxx.com系統研發課，Email : xxx@xxx.com系統研發課，Email : xxx@xxx.com系統研發課，Email : xxx@xxx.com";
        long lStart = System.currentTimeMillis();
        String enString = new DESPlus().encrypt(cSrc);
        long lUseTime = System.currentTimeMillis() - lStart;
        System.out.println("加密值：" + enString);
        System.out.println("加密耗时：" + lUseTime + "毫秒");

        lStart = System.currentTimeMillis();
        String deString = new DESPlus().decrypt(enString);
        lUseTime = System.currentTimeMillis() - lStart;
        System.out.println("解密值：" + deString);
        System.out.println("解密耗时：" + lUseTime + "毫秒");
        System.out.println("############加减密第1测试结束###########");
    }


	
	
}